Hey guys im happy to be new to the site and a new owner of a 2015 WRX. I just have a quick question regarding my purchase. I had purchased the car last Monday with and aftermarket Corsa exhaust already installed. I love the sound. The next day i got a check engine light and brought it right back to the dealership. The dealership ran the codes and told me it was because of an aftermarket CAT. They said they had contacted the previous owner and he agreed to bring in the original one. When i got my car back i realized they didn't just change the CAT. they had changed the entire exhaust system back to stock. I believe the Corsa was a cat-back system so i have no idea why they changed the entire thing. When i confronted the dealership they said they would provide me with the Corsa exhaust but will not reinstall it. What is your take on this. Isn't it illegal to reinstall a used cat for a new owner? Should they have changed out the whole system? I feel a little taken advantage of.